Boiler apparatus

Abstract

A boiler has an outer wall of weldable material and an inner chamber including a high temperature heat exchanger which is connected by pipes passing through openings in the outer boiler wall for the supply and discharge of a heat exchange medium. Each pipe for the heat exchange medium is spaced from and passes through a sleeve-like jacket that is welded to the outer boiler wall and projects outwardly therefrom. A cooling gas is fed into the sleeve-like jacket to pass along an annular space between the jacket and the pipe. The cooling gas flows into an annular chamber between the outer boiler wall and the inner chamber. According to a second embodiment, concentric sleeves are provided in the annular space between the jacket and pipe to pass the cooling gas to and fro within this space.

I claim as my invention: 
     
       1. A boiler including the combination of an outer boiler wall consisting of weldable material, an inner chamber including heat exchanger means spaced inwardly from said outer boiler wall to thereby define an annular flow space for conducting a gaseous medium at a lower temperature than the temperature of the gaseous medium fed into said inner chamber, a feed pipe to deliver the gaseous medium into said inner chamber while forming a continuation of said annular flow space, conduit means coupled to said heat exchanger means and extending through openings in said outer boiler wall for supplying and discharging a gaseous medium at temperatures greater than the permissible operating temperature of the weldable material forming the outer boiler wall, each of said conduit means including a tube coupled to said heat exchanger means, said tube extending from said annular flow space through an opening in the outer boiler wall, a sleeve-like jacket welded to said outer boiler wall to project externally of the boiler in a surrounding relation with said tube to thereby define an annular jacket space between the jacket and the tube, and gas-conducting means for feeding a cooling gas along said annular jacket space to pass into said annular flow space without interfering with the process within the boiler. 
     
     
       2. The boiler according to claim 1 further comprising a compressor means for increasing the pressure of the gaseous media passing along the annular flow space surrounded by said feed pipe in relation to the pressure of the gaseous media passing along the outer boiler wall, and means for conducting pressurized gaseous media after discharge from said compressor means into said gas-conducting means. 
     
     
       3. The boiler according to claim 1 further comprising sleeves concentrically arranged within said annular jacket space, said sleeves having walls that are spaced from one another in such a manner to define gas flow spaces extending in opposite and parallel directions along the length of the sleeves. 
     
     
       4. The boiler according to claim 3 wherein the inner concentric sleeve is secured at one end to said sleeve-like jacket and the outer concentric sleeve is secured to said gas-conducting means at the end of the outer concentric sleeve which is opposite the secured end of the inner concentric sleeve.